Condenser for refrigerating apparatus



May 8,1934. J. ASKIN CONDENSER FOR REFRIGERATING APPARATUS Filed April6, 1952 SIIIII II INVENTOR Jqgg bflall'n BY I ATQNEY Patented May 8,1934 UNITED STATES CONDENSER FOR REFRIGERATING APPARATUS Joseph Askin,Buffalo, N. Y., assignor to Fedders Manufacturing Company, Inc.,Buffalo, N. Y.

Application April 6, 1932, Serial No. 603,549

1 Claim. (Cl. 257255) This invention relates to improvements incondensers which are particularly adapted for use in domestic orcommercial refrigeration apparatus.

The invention relates to a condenser of the fabricated type, wherein aplurality of tubes having an oval or a flattened cross section areconnected to spaced headers which serve as mount-' ing means. Theheaders are devised with baffie portions which direct the fluid streamthrough successive groups of tubes and which in general provide aserpentine liquid path through the entire device, wherein the connectinggroups of tubes serve as ,a multiple leg in each of the convolutionsforming a part of the condenser.

The invention will also be found to reside in 'the structural relationbetween the various parts, which results in economies in material andassembly costs and which is more completely set forth in theaccompanying specification and appended claim.

In the drawing:

Fig. 1 is a perspective view of a typical condenser embodying theprinciples of the invention with portions broken away to show the headerstructure.

7 Fig. 2 is a longitudinal section through the condenser.

Fig. 3 is a fragmentary cross section through one of the headers.

Referring to the drawing, the condenser 10 is formed of a pairof headers11 of identical construction arranged in opposed and reversed relationand connected for fluid communication by the tubes 12. One of theheaders is connected to a source of refrigerant supply through a pipe13, while the remaining header is connected to an output pipe 14,through which the condensed refrigerant passes to the evaporator of therefrigerating device.

The tubes 12 are preferably oval or flattened members which areassembled with suitable fin members 15 to form a unit. This unit ismounted between the header plates 16 which form part of the headers 11and contain lateral rows of slots 17 through which the tube ends engagein parallel rows, each row containing a plurality of tubes. As indicatedby the numeral 18, the projecting ends of the tubes are brazed to theplates 16 to provide a fluid tight joint. Each header plate is formedwith an outwardly extending peripheral flange 21 for connection to theheader body 22.

The fins 15 are thin rectangular members which are similar in elevationto the header plates 16, inasmuch as each contains a plurality of slots20 through which the tubes 12 project. These fins are assembled with thetubes in spaced relation and are finally subjected to a solder bathwhich substantially unites the tubes and fins in an integral unit. Thefins, therefore, provide tension reinforcement for the tubes at regularspaced intervals to resist the fluid pressures to which the tubes aresubjected.

The header body 22 is preferably a casting having a face 23, into whichis formed a series of similar depressions 24 separated by the walls 25.This series terminates atone extremity in a narrower depression 26 incommunication with a fluid connection pasage 2'7, which is entered by atapped hole 28 for connection to the pipe 13 or 14. Upon brazing thebodies to the flanges 21 of the plates (Figs. 2 and 3), it will beobserved that the depressions 24 in the plates are each formed intofluid diverting compartments entered by an even number of rows of tubeends, and that the narrower depression 26 receives a half of such numberof tube ends. This forms a continuous serpentine passage between theinput pipe 13 and the output pipe 14, (Fig. 2), since refrigerant,entering the passage 2'7 in the left hand header is first directed intothenarrow depression 26 thereof, thence through the two rows of tubes 12to the large depression 24 of the opposite header, where it is forcedinto the two remaining rows of tubes in the same depression and back tothe first header.

The fluid follows the above described circuit to the bottom of thedevice where the liquid finally enters the narrower passage 26 of theright hand header for final disposal through the output pipe 14.

It will also be observed that the major axis of each of the tubes 12 isat a slight angle to the lateral line of the plate. This is topreventthe accumulating and subsequent freezing of drops of precipitatedmoisture thereon, when the de-- vice is mounted vertically as shown.

Plates 31 extend between the headers and pro-- tect the enclosed tubesand flns from damage and also serve to protect the tube assembly fromdamaging stresses. These plates are provided with a flange portion 32 ateach extremity, which engage over and are brazed to opposite corners ofthe holder plate 16.

It will also be noted that enhanced strength and rigidity are obtainedby forming ribs 33 in the outer faces of the headers 11.

It will be appreciated that the inventor provides a highly efficient andeconomical condenser,

in which thermal efilcienc'y is obtained with reasonable cost byproviding flat or oval tubes made to communicate with each other throughthe header members 11. The flat or oval tube has been folmd moreeifective than a round tube for the same type of work, and adequateprovision is made for communication between the several series of tubesby the relatively large chambers 24, which do not interfere with therate of flow and which also serve to direct the fluid in a long path.

It is also apparent that various modifications may be made in thespecific structure herein described to illustrate the principles of theinvention, as set forth in the following claim:

I claim:

A condenser for refrigerating apparatus comprising a plurality offlattened tubes arranged in a plurality of superimposed parallel rows,the

tubes in each row being rotated with respect to their longitudinal axes,a plurality of fins disposed perpendicularly to said rows, said flnsbemousse ing formed with apertures to receive said tubes, plane headerplates secured to said tubes at the ends thereof, said header platesbeing formed with apertures through which said tubes project, saidplates and tubes being sealed to each other around said apertures,flanges formed along the margins of said plane header plates, andheaders positioned in contact with said plate between said flanges, saidheaders being formed with plane surfaces on their inner portions adaptedto contact said plates and angularly disposed surfaces adapted tocontact said flanges, recessed portions formed on the inner portions ofsaid headers, cross ribs disposed in said recessed portions to dividethe same into a plurality of chambers, the chamber at one end of each ofsaid headers being smaller than the remaining chambers, the cross ribsbeing disposed between said rows of tubes, and fluid connecting meanssecured to said smaller chambers.

JOSEPH ASKIN.

